In a closed herd, how quickly does the frequency of a low gene increase initially?

In a closed herd, how quickly does the frequency of a low gene increase initially?

• A. Fast
• B. Slow
• C. Moderate
• D. Unpredictable

Answer: (B)

In the context of a closed herd, where no new individuals are introduced and breeding occurs only among existing members, the initial frequency of a low gene tends to increase at a slow rate. This is primarily influenced by genetic drift and the limited genetic diversity in such a population.

In a closed system, the breeding population is relatively small, so random mating tends to have a pronounced impact on allele frequencies over time. Initially, the change might not be very stark because the starting frequency of the low gene may be low, and the small population size means that there may not be enough individuals carrying that gene to significantly alter its frequency quickly.

As generations pass, natural selection or other factors might play a role in increasing the frequency of the gene if it provides some advantage, but in the early stages of a closed herd situation, the process is inherently slow due to the constrained genetic pool and limited opportunity for the low gene to proliferate rapidly among the herd's members.